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Liability for Unpaid Losses and Loss Adjustment Expenses - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 01, 2021
Jul. 01, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]            
Direct losses and loss adjustment expenses     $ 264,068 $ 347,207 $ 777,668 $ 682,896
Incurred related to prior years     11,489 30,085 17,983 34,904
Ceded losses and loss adjustment expenses     76,487 108,730 278,903 158,026
Term of notice 2 years 3 years        
Adverse Prior Years' Reserve Development            
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]            
Direct losses and loss adjustment expenses     87,900   296,900  
Incurred related to prior years     11,500   18,000  
Ceded losses and loss adjustment expenses     76,400   278,900  
Hurricane            
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]            
Direct losses and loss adjustment expenses     81,700 136,700 282,900 190,800
Incurred related to prior years     5,300 30,100 4,000 34,900
Ceded losses and loss adjustment expenses     76,400 $ 106,700 278,900 $ 155,900
Settlement on Litigated Claims            
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]            
Incurred related to prior years     $ 6,200   $ 14,000